Hello,
On Thu, Dec 9, 2010 at 5:13 AM, Michael Poulos poulo...@gmail.com wrote:
Recently I bought a Efratom Ru frequency standard from eBay and a frequency
divider chip that makes 1MHZ,100KHZ,25KHZ,10KHZ,100HZ and a 1HZ output.
Today I thought of a way to make a nice 60HZ so you can use a
If you can indeed track a 1W signal from ~ Colorado, there might indeed be
some timing use for the system.
I have a start at understanding how much data you can get through a channel.
There is a tradeoff between data rate and error rate and it depends on the
signal/noise ratio.
Is there a
In message 20101209105031.6104c800...@ip-64-139-1-69.sjc.megapath.net, Hal
Murray writes:
Is there a similar sort of high level picture about sending timing info? I'm
not even sure what the units are.
Basically with timing you only send one bit: now
The most precise way to send that bit is
Hi
... and for a very low power system, there's no reason to stick with a short
512 bit data set, or a fast 1 second rep rate.
If the signal is a only at night sort of thing (as I'm guessing it is over
that path), all you really might do is a couple of time transfers a night. A
code that
Hi
Another simple approach:
Run a PIC off of it's internal R/C clock
Divide to both 60 Hz with a divider that will do M, M-N, M+N where N is
1,2,3,4,5 and covers the expected tolerance of the clock
Divide the 60 Hz to 1 Hz
Compare the 1 Hz to a pps output
Based on the 1 Hz being early / late,
Magnus Danielson wrote:
On 12/08/2010 07:18 PM, jimlux wrote:
Chris Albertson wrote:
Adding time code to video would be redundant. All video is already
time coded.
All *digital* video is timecoded..
No, not all digital video. The time-code is optional in many of the
transfer formats.
Javier Herrero wrote:
I was thinking about how good or how bad would result the use of an LVDS
line receiver ... but it is only a though :)
That's what I was using before, and it doesn't work very well..
Small common mode voltage range and large hysteresis.
They're really designed to take
Chris Albertson wrote:
Of all the ways to square a sine wave I think the best might be to use a PLL.
the raising edge of your output square wave would trigger a sample of the
input sine wave. The distance from zero volts of that sample is the
phase error.
The goal is to have the raising edge
Hal Murray wrote:
If you can indeed track a 1W signal from ~ Colorado, there might indeed be
some timing use for the system.
I have a start at understanding how much data you can get through a channel.
There is a tradeoff between data rate and error rate and it depends on the
signal/noise
Good to know. Now I see what not to use :) I was supposing that the
hysteresis would not be so high being low voltage signalling, and since
they are used for low-jitter applications. But really I've only used
them for their intended main applications :)
Best regards,
Javier
El 09/12/2010
Javier Herrero wrote:
Good to know. Now I see what not to use :) I was supposing that the
hysteresis would not be so high being low voltage signalling, and since
they are used for low-jitter applications. But really I've only used
them for their intended main applications :)
hysteresis is
El 09/12/2010 15:21, jimlux escribió:
Javier Herrero wrote:
Good to know. Now I see what not to use :) I was supposing that the
hysteresis would not be so high being low voltage signalling, and
since they are used for low-jitter applications. But really I've only
used them for their intended
Javier Herrero wrote:
El 09/12/2010 15:21, jimlux escribió:
Javier Herrero wrote:
Good to know. Now I see what not to use :) I was supposing that the
hysteresis would not be so high being low voltage signalling, and
since they are used for low-jitter applications. But really I've only
used
WHAT chip are you using that has the nice divide by 10 outputs please?
I have been wiring 74ls XXXs for years what a pain. Tired of the soldering.
Thanks
Paul
On Thu, Dec 9, 2010 at 7:47 AM, Bob Camp li...@rtty.us wrote:
Hi
Another simple approach:
Run a PIC off of it's internal R/C clock
Familiar with that.
I thought he had another chip from his first email.
Maybe I am wrong it always seemed like a reasonable chip someone would make.
On Thu, Dec 9, 2010 at 11:47 AM, Cook Mike mike.c...@orange.fr wrote:
Le 09/12/2010 16:54, paul swed a écrit :
How about a PIC again, as per
Hi Roberto,
Do You have any idea when the two volume Service Manual for the HP 3586A,B,C
will be uploaded to Your web site.
Best regards,
Sal C. Cornacchia
Electronic RF Microwave Engineer (Ret.)
The information contained in this e-mail transmission is privileged and/or
confidential
What you are doing is dithering. That is the Leap Count. There is a better
way that gives you the exact solution. If you think about it, what is the
computer doing between counts? nothing really. Put that time to use.
Why not measure the the 1Khz period. Or measure the period of the last
Perry...
From time to time (OK, that was a little too lame) TAPR has GPS antennas for
good prices.
www.tapr.org.
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Perry Sandeen
Sent:
I have one of the TAPR antennas:
http://tapr.org/gps_ant1a.html
I'm willing to part with for the price of shipping.
-Eric
On Thu, Dec 9, 2010 at 9:57 AM, Tom Holmes thol...@woh.rr.com wrote:
Perry...
From time to time (OK, that was a little too lame) TAPR has GPS antennas for
good prices.
2nd that !
-pete
On Tue, Nov 30, 2010 at 2:28 PM, paul swed paulsw...@gmail.com wrote:
Just want to say a very nice job that you have done Roberto.
Regards
Paul
WB8TSL
On Tue, Nov 30, 2010 at 9:26 AM, SAL CORNACCHIA salc...@rogers.com wrote:
Hi Roberto,
I would be interested?
Thank
If one actually requires a low phase noise/low jitter output using a
Schmitt trigger is not a good idea.
The effective threshold is modulated by the internal noise of the
schmitt trigger circuit itself.
This effect can be very significant with low phase noise sources and a
fast Schmitt trigger.
jimlux wrote:
Javier Herrero wrote:
El 09/12/2010 15:21, jimlux escribió:
Javier Herrero wrote:
Good to know. Now I see what not to use :) I was supposing that the
hysteresis would not be so high being low voltage signalling, and
since they are used for low-jitter applications. But really
No, actually to feed a bunch of synthesizer chains (for which the sine
wave will work fine) and to drive sampling clocks on ADC/DAC (for which
one wants a low jitter square wave).
A digital radio...
There are some nice residual plots for AC and CMOS chips at
Hi
...and sometimes they leave the Schottkys out.
The original request was not a really low jitter application. I think Jim
can get away with an active circuit.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Miles
Sent:
Hi All,
I'm looking for approximately 10 of the Jupiter GPS modules
for a personal timing project; I time automotive speed events.
I'm aware of the units available on eBay from Hong Kong but
would like to try to source them from US markets first.
Thanks for any assistance,
Dabney in Denver
Will be interesting to see if there is a US source and still at a reasonable
cost.
I did not find one
On Thu, Dec 9, 2010 at 4:43 PM, Dabney Crump dab...@dhcrump.com wrote:
Hi All,
I'm looking for approximately 10 of the Jupiter GPS modules
for a personal timing project; I time automotive
Hi Dabney,
Why the Jupiter? I assume it's for the 10kHz output, but can't see where that
applies to automotive timing. I have a couple of Jupiters and also have an
interest in automotive speed events. The fastest speedometer I've designed and
built so far did over 770MPH.
Regards,
Robert
Hi Pete, Sal,
Luckily I've been able to invest a few unexpected evenings on the manual and
all the long boring work is already done. I'm now reviewing it thoroughly as
I'd like to avoid having to fix silly mistakes after people have already
downloaded it (something which is plainly
On 12/09/2010 02:46 PM, jimlux wrote:
Magnus Danielson wrote:
On 12/08/2010 07:18 PM, jimlux wrote:
Chris Albertson wrote:
Adding time code to video would be redundant. All video is already
time coded.
All *digital* video is timecoded..
No, not all digital video. The time-code is optional
On 12/9/2010 11:18 PM, Roberto Barrios wrote:
Luckily I've been able to invest a few unexpected evenings on the manual and
all the long boring work is already done. I'm now reviewing it thoroughly as
I'd like to avoid having to fix silly mistakes after people have already
downloaded it
On 12/09/2010 03:16 PM, jimlux wrote:
Hal Murray wrote:
If you can indeed track a 1W signal from ~ Colorado, there might
indeed be
some timing use for the system.
I have a start at understanding how much data you can get through a
channel. There is a tradeoff between data rate and error rate
My general solution to generating clock frequencies of any frequency
is to
take a middle frequency from the divider chain (say 10kHz) and feed
it into a PLL
chip with a divider (say 3 or 6 using a Johnson counter which resets)
in the feedback loop.
This multiplies the VCO output by 3 (30kHz
i don't have 10, but I have a few that will want new homes. will have to
dig this WE
On 12/9/2010 3:43 PM, Dabney Crump wrote:
Hi All,
I'm looking for approximately 10 of the Jupiter GPS modules
for a personal timing project; I time automotive speed events.
I'm aware of the units available
Would be interested
Regards
Paul.
On Thu, Dec 9, 2010 at 6:25 PM, Oz-in-DFW li...@ozindfw.net wrote:
i don't have 10, but I have a few that will want new homes. will have to
dig this WE
On 12/9/2010 3:43 PM, Dabney Crump wrote:
Hi All,
I'm looking for approximately 10 of the Jupiter GPS
Hi Robert,
Yes, its for the 10kHz output.
Basically the units will be part of a set of timing computers that will
be used at
fixed locations to measure time intervals.
That's very fast, how did you test it at that speed?
Thanks - Dabney
On 12/9/2010 3:02 PM, Robert Atkinson wrote:
Hi
paul swed wrote:
WHAT chip are you using that has the nice divide by 10 outputs please?
I have been wiring 74ls XXXs for years what a pain. Tired of the soldering.
Thanks
Paul
The chip was one I got on eBay from a different seller than the Ru
movement. The chip number is a C8051T602.It's
Chris Albertson wrote:
What you are doing is dithering. That is the Leap Count. There is a better
way that gives you the exact solution. If you think about it, what is the
computer doing between counts? nothing really. Put that time to use.
Why not measure the the 1Khz period. Or
Michael Poulos wrote:
snip
Like any frequency multiply scheme you need a really accurate
reference source... like a Ru movement.
Not to be too nit picky (this is timenuts after all) ... the proper
abbreviation
for Rubidium (it is an element) is Rb.
BillWB6BNQ
Michael,
You can get 32768 Hz from 10 MHz using a single 8 pin PIC.
http://www.ni6e.com/time/10M32K.html
Regards,
Peter
On 12/9/2010 4:19 PM, Michael Poulos wrote:
The chip was one I got on eBay from a different seller than the Ru
movement. The chip number is a C8051T602.It's actually a
On 10/12/2010, WB6BNQ wb6...@cox.net wrote:
Michael Poulos wrote:
snip
Like any frequency multiply scheme you need a really accurate
reference source... like a Ru movement.
Not to be too nit picky (this is timenuts after all) ... the proper
abbreviation
for Rubidium (it is an
WB6BNQ wrote:
Michael Poulos wrote:
snip
Like any frequency multiply scheme you need a really accurate
reference source... like a Ru movement.
Not to be too nit picky (this is timenuts after all) ... the proper
abbreviation
for Rubidium (it is an element) is Rb.
On Thu, Dec 9, 2010 at 4:19 PM, Michael Poulos poulo...@gmail.com wrote:
The chip number is a C8051T602.It's actually a tiny printed circuit card in
a DIP chip pinout format. Anyone know of a microcontroller that'll take
the
raw sinewave from a Ru movement?
The C8051T602 is a micro
42 matches
Mail list logo
